Heating apparatus for leaches



Hum w, 1923. 145,629 v W. H. JOHNS HEATING APPARTUS FOR LEACHES FiledApr-i1 18, 1922 mvENToR ATTO R N EY WITNvESS:

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ATTORNEY Patented June 19, 1923a PATENT erica,

i WILLIAM HENRY JOHNS, OF KINGSPORT, TENNESSEE.

HEATING APPARATUS FOR LEACHES.

Application filed April 18, 1922. Serial No. 554,500.

To @ZZ 'whom t may concern:

Be it known that I, VVILLLAM H.' JOHNS, a citizen of the United States,residing at Kingsport, in the county of Sullivan and- State ofTennessee, have invented new and useful Improvements in HeatingApparatus for Leaches, of which the following is a specification.

This invention relates to a heating apparatus for use in leaching andespecially in extracting liquor for tanning purposes.

One object is to provide a system of circulation which will eliminateall possibility of explosion, and which will produce a uniform heat witha minimum quantity of steam.

A further object is to introduce live steam and air into the liquor asit passes from one 4, tub to another, avoiding the necessity ofadmitting the steam directly to the leach, which tends to cause the woodor bark around the live steam pipe to cook and form a non-solublesubstance which will assume the form of sediment or mud in the tanningliquor.

A further object is to introduce live steam and air at a particularpoint in the pipe conveying the liquor from one tub to another, thefluid being carried to the second tub undeimsteam and air pressure, in aconstant stream, and will at the same time be uniformly heated.

A still further object is to provide for the extraction of tanningliquor from crushed wood or bark, the apparatus being equally adaptedfor other forms of leaching, rendering possible the even transmission ofthe liquor from the bottom of one tub to the top of the next tub, sothat it will spread over the surface of the material in the tub lastnamed, and prevent the substance from rising to the top at the beginningof the operation and before it has become saturated.

lith the foregoing and other objects in view, the invention consists 1nthe novel arrangement of elements described and claimed, it beingunderstood that modifications may be made within the scope of theclaims, without departing from the spirit of invention. l

In the drawings, Figure 1 is a View of the apparatus in vertical sectionand elevation; Figure 2 is a view, with parts broken away, showing theair and steam intake elements; Figure 3 is a vertical section of thesprinkling device; Figure 4 is a transverse seetion thereof.

The tub 10 is'provided with a bottom 11 and with a false bottom 12spaced above the bottom rst named, a second leach tub 13 being similarlyconstructed, and connected with tub 10 in the manner described below.

A four-way connection 14, sometimes termed a cross is mounted 'below thebottoms of the tubs, and at a point intermediate thereof. The flow ofliquor to and through this four-way connection is controlled by means ofvalves 16 and 17. The casing of each valve is in communication withelement 14 through connection 18, and is in communication withthefoutlet 20 of the correspondingr tub through elbow 21 and connections22 and 23.

A pipe 25 is connected with outlet member 26 of the element 14, thispipe passing upwardly to a point above the tubs, thence horizontally,and then downwardly into tub 13. The valves 16 and 17 are controlled byrods 28 and 29, these rods Vcarrying hand wheels 30 and 31 above theplatform 32.

Steam is introduced into pipe 25 through the four-way connection 14, theintake pipe being designated 84. This pipe has connection with a T 35,and the steam passes thence through discharge nozzle 36 into pipe 25,and at the point shown.

Air is admitted through pipe 38 which enters the lower side of theT-connection,

lso

and passes thence upwardly through pipe 36 and to a point slightly abovethe upper end of the pipe last named. The precise relation of the airand steam pipes with reference to each other and with reference to thevolume of liquor flowing through pipe 26 is important, and it will benoted that the liquor flows by gravity through the fourway connection 14and to a point slightly above the latter, the gravity pressure beinguniform and constant, and the heating and propelling Huid beingeffective at the point where the best results are secured in the way ofproviding for an even and constant flow.

Deta-chably connected with the discharge' end 25 of pipe 25, is adistributing element including a perforated plate 40 secured by brackets41 with tubular element 42. The plate is convex, as shown, on the sideto which the brackets are secured, this arrangement aiding in thedistributing operation. Member 42 has threaded connection with a sleeve43, and the upper end of the bore of `the latter is smooth, so that thiselement -rial in the tub, at the beginning of the operation, serving thepurpose previously indicated. The C listributing device may then beremoved during the further operation of the apparatus.

The tub 10'is first employed, the valve 16 being open. The liquor Vflowsfrom this tub through pipe 25 to the upper portion offtub 13, and whenthe operation is completed sofar as the iirst tub is concerned, valve 16is closed and valve 17 is open, so that the circulation is through pipe25 downwardly through tub 13, through the outlet in the bottom of thattub, and thence through valve Gesine 17, four-Way Connection le,returning through pipe 25, this circulation be'- ine maintained as longas required.

yIaving thus' described my invention, I claim;

-1. In a device o f the vclass described, a leach tub, having an outletopening in the bottom thereof, a second tub having a similar openinginthe bottom, means connecting the outlet openings and including avplurality of valves and ,their casings, a casing between the valvecasings and connected therewith, a liquor outlet pipe leading from theupper portion of the casing and located between the valve casings, asteam intake pipe entering the bottom of the casing so located anddischarging into the outlet pipe leading from that casing, at a pointbelow the bottoms of the tubs, and an air intake pipe Within the steampipe and discharging at a point slightly above the discharge point ofthe steam.

2. In a device of the class described, a leach tub having an opening inthe bottom thereof, a second tub having an opening in its bottomconnecting said opening and including a plurality of valves and theircasings, an intermediate casing, an outlet pipe leading from saidintermediate casing to the top of the second namedtub, a distributingand spraying device connected with the pipe, for spreading liquor overthe mass of material in the second named tub, and steam and air intakepipe leading through the intermediate casing and intol the lower portionof the pipe having communication therewith.

3. A distributing device for leaching apparatus, comprising a sleeve tobe connected with a pipe, a tubular element connected With the sleeve,brackets extending radially from the tubular element, and a perforatedplate, convex @none side, the brackets being secured to the plate nearits edges and on the convex side thereof.

In testimony whereof I aiiiX my sienature.

WILLIAM HENRY JoeINs.

